about localbitcoins:
But I compiled a list of German users who you can trade with for $10.000+ from Germany. Here is the list:
https://localbitcoins.com/instant-bitcoins/?action=buy&country_code=DE&amount=10000¤cy=USD&place_country=DE&online_provider=ALL_ONLINE&find-offers=Search
There is also a bitcoin ATM in Munich:
https://coinatmradar.com/bitcoin_atm/6205/bitcoin-atm-orderbob-atm-munich-monte/
They closed their service in Germany because of the financial supervision (BaFin). There is "bitcoin-treff.de", here you can meet people to buy Bitcoins, but the volume is not as high as with localbitcoins.
Recently some Bitcoin ATMs have been set up, but there Coinatmradar hasn´t list all.
If you need a german languaged guide for Bitcoin kaufen you can find it under the link.